Calciotantite

General Information:
 Chemical Formula:
Ca(Ta,Nb)4O11
 Composition:
(Molecular Weight = 670.87 gm)
Calcium 5.97 % Ca
Tantalum 53.94 % Ta
Niobium 13.85 % Nb
Oxygen 26.23 % O 
 Empirical Formula:
CaTa2NbO11
 Environment:
Granite pegmatites.
 IMA Status:
Approved IMA 1982
 Locality:
Kola Peninsula, Russia.
 Name Origin:
Named for its composition (Calcium, Tantalum).
Physical Properties:
 Cleavage:
None
 Color:
colorless.
 Density:
7.46
 Diaphaniety:
Transparent
 Habits:
Square - Occurs as square crystals in shape or outline., Hexagonal - Six-sided crystal shape in cross-section or habit., Inclusions - Generally found as inclusions in other minerals.
 Hardness:
6.5 - Pyrite
 Luminescence:
Non-fluorescent.
 Luster:
Adamantine
 Streak:
white
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